The physical properties of submicron and nano-grained la0.7sr0.3mno3 and nd0.7sr0.3mno3 synthesised by sol–gel and solid-state reaction methods

Lik Nguong Lau, Kean Pah Lim, Amirah Natasha Ishak, Mohd Mustafa Awang Kechik, Soo Kien Chen, Noor Baa’Yah Ibrahim, Muralidhar Miryala, Masato Murakami, Abdul Halim Shaari

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

La0.7Sr0.3MnO3 (LSMO) and Nd0.7Sr0.3MnO3 (NSMO) possess excellent colossal mag-netoresistance (CMR). However, research work on the neodymium-based system is limited to date. A comparative study between LSMO and NSMO prepared by sol–gel and solid-state reaction methods was undertaken to assess their structural, microstructural, magnetic, electrical, and magneto-transport properties. X-ray diffraction and structure refinement showed the formation of a single-phase composition. Sol–gel-synthesised NSMO was revealed to be a sample with single crystallite grains and exhibited intriguing magnetic and electrical transport behaviours. Magnetic characterisation highlighted that Curie temperature (TC) decreases with the grain size. Strong suppression of the metal–insulator transition temperature (TMI) was observed and attributed to the magnetically disordered grain surface and distortion of the MnO6 octahedra. The electrical resistivity in the metallic region was fitted with theoretical models, and the conduction mechanism could be explained by the grain/domain boundary, electron–electron, and electron–magnon scattering process. The increase in the scattering process was ascribed to the morphology changes. Enhancement of low-field magnetoresistance (LFMR) was observed in nano-grained samples. The obtained results show that the grain size and its distribution, as well as the crystallite formation, strongly affect the physical properties of hole-doped manganites.

Original languageEnglish
Article number361
JournalCoatings
Volume11
Issue number3
DOIs
Publication statusPublished - 2021 Mar

Keywords

  • CMR
  • Hole-doped
  • LFMR
  • Manganites
  • Single crystallite

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'The physical properties of submicron and nano-grained la<sub>0.7</sub>sr<sub>0.3</sub>mno<sub>3</sub> and nd<sub>0.7</sub>sr<sub>0.3</sub>mno<sub>3</sub> synthesised by sol–gel and solid-state reaction methods'. Together they form a unique fingerprint.

Cite this